Double-cut harrow.



' H. S. DICKINSON.

DOUBLE CUT HARROW. APPLICATION FILED APB. 9, 1914.

H. S. DIGKINSON. u

DOUBLE CUT HARROW.

APPLICATION FILED APR. 9, 1914.

Patented 0011.27, 1914.

2 SHEETS-SHEET 2.

on the `rear unit are afforded for maintainl to a considerable. degree of angularity befication.

degree approaching a right angle before the llIIEDl STATES f HARRY s. nI'cKIrrsoiv',v orV or MoLINE,` ILLINOIS, A'ooItroRA'rIon or ILLINOIS.

DOUBLE-cnr H l.

mismo.

To all lwhom it may concern."

Be it known ,that I, HARRY S. DIcKiNsoN, a citizen of the'United States, residing 'at Moline, in the countyof Rock Island 4and State oflllinois, have invented certain new and useful Tmprovements' in Double-Cut Harrows, of which the following is a speci-- d This invention has particular reference to a compensating "connection betweenthe front' and"rearunitscomprising a double cutharrow, and the object of the invention is to sov construct and arrange the" connectionthat the Vrear 'section or unit will in turningbe positively held and maintained in the true line of advance of thedraft animals so that the disks or other furrow openers in making'the turn will travel in the' true arcof a circle which is important in Inaintaininguniformity in the furrows and in the avoidance of uneven turning movements which tend to ditch out the ground' and impose severe strains uponthe imple- Tnthe case of double cut harrows, commonly in use, a single central pivotal connection is employed between the front and rear'units and no means, other than the drag ing the two units in propei relation to one' another.l In turning such 'an implement, the tendency especially in 'rough for hard ground, is'for the front unit to initially turn fore any draft in the new direction is impartedto the rear unit. Tn .-fact in most cases; the parts will be initially turned to a vcontinued pullA of the draft lanimals has the effect of turning or. dragging the rear unit around into' the new line of advance. As soon as the" pull is felt,howeventhe'reargunit will .be dragged'orslued around by, a lateral pull,l in a; direction' broadsid'e, to the-em'- bedded diskswith the result'that'a holewill be ditchedin'the ground and a 'severe and sudden strain or jerk imposed upon the single pivotal connection and upon all portions' of the implement.'

' With the improved compensatingconnection,"whi`ch forms the`subject matter of this invention, as soonas the draft animals begin' tdinake, aA ,tur`n,the lateral v'draft will" have the effect of immediately throwing the Specicationof Letters Patent. Application led April 9V, 1914. Serial No. 830,608.

" Fig. l is a Batented @et 27, tail-1l.

front and rear units into an angling position with one another such that the rear unit wlll immediately begin' to trail the. front .unit in the newly-established line of curvature occasioned by the turning of the draft animals. This will have the effect of avoiding the imposition of sudden strains or Jerks on the connection and of avoiding broadside strains against the embedded disks and will also result in the formation of a true and evenly cut furrow irrespective of the inequality-or hardness of the ground. Further features will be apparent from the subsequent description of the invention' which consists in the features of construction and combinations of parts hereinafter described and claimed.v

In the drawings: Figure l is a plan view of the implement with the front and rear sections in parallel or unturnedrelation; Fig. 2 is an enlarged detail showing the compensating connections in normal or unturnedl position; Fig. 3 is a similar view showing the parts in turned position; and

detail showing one ofthe connecting" compensating rods overlying the other. l i

.Tn the drawings, the front unit comprises a draft tongue 5, to the rear end of which is secured a cross' bar G which is braced by diagonald braces 7 of the usual type. The front' section further comprises a pair of diskfgangsl 8 8 which are connected to the outer end's of the cross bar G-by strap links 9. The present invention, however, is not concerned with the details of construction of either the 'front or rear units so that it will be'vunderstood that these parts may be changed or modified without effecting the resent invention.

The, draft tongue has `extending rear- Qwardlytherefrom a .pair of bars i10--10 which in effect constitute a portion of the front frame and afford points/of attachment for the compensating connection which more particularly forms the subject matter of the invention, These bars 10-10 have their rear ends'll-ll spread ordflared to aHord two 'socket holes 12-12 into which are pivoted the forward ends of a pair of compensating connecting bars 13-13 which are arranged in X relation to one another, and overlie one another, as best'shown in Fig. 4. h The compensating connecting bars are of -carries the rear harrow unit.

ceive the front and rearends of the compensating connection bars be equally spaced in order that, in turning, the pull on one of the bars be commensurate with the thrust on the other bar as best indicated in Fig. 3.

sections are tangent to this curve.

The rear' frame, as shown, is provided at its end with rearward extensions 17-17 to which the rear gangs 18-18 are pivoted, although the details of construction of this portion "of theimplement. are unimportant and may be varied without effecting the operation of the compensating connection hereinbefore described. Front levers and connections 19 are provided for angling the front pair of gangs with respect to one another, and a rear lever and connections Q0 are likewise provided for angling the pair of rear gangs with respect to one another, but these details are unimportant and may be changed or modified in ways Well understood in the art to meet structural requirements of various implements now in common use. A

In use, with the implement advancing in a straight line, the compensating connecting bars will occupy the relative positions shown in Fig. 2, and the pull of the draft animals will serve to maintain the front and rear units in parallel relation with one another. But when the implement begins to turn the connections will be thrown into the position shown in Fig. 3. In this figure, the line A-b-A represents the turning li'ne of advance and it will be noted that the longitudinal centers of boththe front and rpilar is tangential relation is established and maintained by reason vof the fact that when the front unit begins to turn one of the com-v pensating connecting bars willexert a pull on the rear unit and the companion connecting bar will exert a corresponding lthrust lwhich throw the parts to a degree of anguk; larity with respect to one another commensurate with the line of curvature representing the turni-ng advance of the draft animals. l'

In view of the fact that the center of the rear unit, at the point where the draft is applied, is held in co-incidence with the curving line representing the 4turning direction of the implement it must be apparent that the pull on. the rear unit will always be a forward pull in the proper direction and not an objectionable lateral pull which is exerted upon the rear unit in cases where a single centrally disposed pivotal connection is relied upon to transmit the draft fromthe of advance of the implement.

front. to the rear unit as is the ordinary practice. Furthermore, the connection is one which allows suiiicient flexibility to accommodate the harrow units to elevations or.

depressions which are frequently ,encountered in the plowing of rough ground, and at the same time maintain the front and rear units in the proper angularity with one another to facilitate the turning of the implement. The construction is one which possesses not only functional but also structural advantages in that itpermits the use of two connections instead of one, thereby dividing the strains incident to use while at the same time minimizing the strains and shocks by reason of the superior functioning of the Vparts inautomatically adjusting the harrow units to meet the requirements ofactual operation.

While the connection to which the present invention particularly relates will serve especially the function of guiding and directing the second unit of harrows when taking curves, stillI wish to point out the fact that it will also serve to assist in keeping they harrows in roper relation during norma progress of t e implement. A

I claim:

l. In combination with front and rear harrow units employing disks, a compensating connection in form to automatically angle the units to a degree commensurate with changes in the direction of advance of the implement. i v

2. In combination with front and lrear harrow units employing disks, compensating connecting bars pivoted to the front and rear units respectively in a manner to automatically angle the units to a degree 'commensurate with the changes inthe direction 3. In combination with front and rear harrow units employing diskscompensati-ng connecting bars crossing one another and pivotedfto the front and rear units respectively in .a manner to automatically Y anglel l the units vto "a degree commensurate with the f changesin the direction of advance of the.

implement.

y4. In comblnation with front and rear harrow units comprlsing each a frame and disk furrow' openers carried thereby, a comi pensating connection consisting of 'crossed 'bars pivoted at their front ends to the front unitand attheir rear ends to the rear unit and adapted to automatically angle the front and rear units to' a degree commensurate with changes in the direction of the advance of the implement.

5." In combination wlth front and rear harrow units, 'th'e'f-ront unit comprising a tongue and frame andd'isks'carried thereby, and the rear unit comprising a frame and disks carried thereby, thefront unit having A an extension projecting rearwardly fromthel meeting bars having their front ,an

ends pivoted respectively in the front and tongue and provided at its rear end with spaced socket holes, a. portion' of the rear frame being provided with'smilarly spaced socket holes and crossed compensating conrear rear socket holes and adapted to automatically angle the front and rear units'to a degree commensurate with changes in the direction of the Vadvance of the implement. HARRY S. DICNSGN.

Witnesses:

L. C. BLANDING, J. J. ELA. 

